Add price-trends: monthly median $/TB over time (consumer vs enterprise)

Computed monthly medians (Jul 2024 onward) plus a chart and a write-up
(the trend, method, buyer takeaway, and usage note). Aggregate only - no
underlying per-drive price observations.

README.md

@@ -14,6 +14,8 @@ Maintained at [nasdisks.com](https://www.nasdisks.com/), where the same data pow
 
 ## What's inside
 
+**Price trends:** [`price-trends/`](price-trends/) tracks the monthly median $/TB for NAS drives over time (consumer vs enterprise) - the storage price crunch in one chart, plus the computed data.
+
 | File | Rows | What it is |
 |------|------|------------|
 | [`data/drives-2026-09-04.csv`](data/drives-2026-09-04.csv) | 273 | The headline file: one flat row per drive, all specs and failure rate combined. |
@@ -22,8 +24,6 @@ Maintained at [nasdisks.com](https://www.nasdisks.com/), where the same data pow
 | [`data/backblaze-afr-2026-09-04.csv`](data/backblaze-afr-2026-09-04.csv) | 31 | Annualized failure rates over a rolling window through Q2 2026 (full-year 2025 plus the Q1 and Q2 2026 quarters), computed from Backblaze raw Drive Stats. |
 | [`data/series-reliability-2026-09-04.csv`](data/series-reliability-2026-09-04.csv) | - | Manufacturer series specs (warranty, rated workload, MTBF) used as context where Backblaze has no data. |
 
-**Price trends:** [`price-trends/`](price-trends/) tracks the monthly median $/TB for NAS drives over time (consumer vs enterprise) - the storage price crunch in one chart, plus the computed data.
-
 ## Quick start
 
 The files in `data/` are ready to use as-is. If you'd rather hit a live endpoint (CORS-enabled, cached, no key, no rate limit):